League of Legends now makes you press a button when the queue pops, so that people who are AFK don't get in, but they still have problems with it in-game. I think it's been said that they won't implement a system like in DOTA, where games with leavers don't count, because they're afraid people will abuse it (same reason they're not adding a Tiny-like character), which I feel is being a bit closed minded about it.